Kärcher HD 4000 C Operating Instructions Manual page 25

HD 4000 C / HD 6000 C
Problem
General fault and
"Water supply fault"
LED light up on
printed circuit board
General fault and
"HD pump
temperature fault"
LED light up on
printed circuit board
General fault and
"Admission pressure
of hot-water pump
too low" LED light
up. (Only with ABS
hot water)
General fault and
"Drop in system
pressure" LED light
up on the printed
circuit board (flow
without pressure
longer than
15 seconds)
5.956-648 A10369 (06/98)
F. Trouble Shooting
Possible cause
Insufficient water in
float tank
Temperature of the water
inlet too high
Cooling water quantity too
low:
Strainer in pressure reduction
valve contaminated
Mains water pressure too low Raise pressure
Cooling coil calcified,
solenoid valve defective
Oil level too low
Oil change not made, owing
to which there is oil carbon
under the piston guide shoes,
piston seizing.
Rotation direction of
precompression pump wrong
Pressure switch
precompression hot-water
pump in the ABS hot water
defective
Too many utilisers
simultaneously opened
Pipe burst in the
high-pressure network
Pressure switch defective
Remedy
Check site water supply
Reduce inlet temperature
Clean strainer
Decalcify,
replace solenoid valve
Check oil level
Check pump parts,
replace as necessary.
Make an oil change
Change rotation direction
Replace pressure switch
Close down some utilisers Operator
Turn off installation and
repair pipeline
Replace pressure switch
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